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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.1063 Vulnerability in sendmail impacts AIX 9 April 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: sendmail Publisher: IBM Operating System: AIX Impact/Access: Access Confidential Data -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2014-3956 Reference: ESB-2016.1867 Original Bulletin: www.ibm.com/support/docview.wss?uid=isg3T1027341 - --------------------------BEGIN INCLUDED TEXT-------------------- Security Bulletin: Vulnerability in sendmail impacts AIX (CVE-2014-3956) Security Bulletin Summary There is a vulnerability in sendmail that impacts AIX. Vulnerability Details CVEID: CVE-2014-3956 DESCRIPTION: The sm_close_on_exec function in conf.c in sendmail before 8.14.9 has arguments in the wrong order, and consequently skips setting expected FD_CLOEXEC flags, which allows local users to access unintended high-numbered file descriptors via a custom mail-delivery program. CVSS Base Score: 2.1 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/ 93592 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (AV:L/AC:L/Au:N/C:N/I:P/A:N) Affected Products and Versions AIX 5.3, 6.1, 7.1, 7.2 VIOS 2.2 The following fileset levels are vulnerable: key_fileset = aix Fileset Lower Level Upper Level KEY - ------------------------------------------------------------ bos.net.tcp.client 5.3.12.0 5.3.12.10 key_w_fs bos.net.tcp.server 5.3.12.0 5.3.12.6 key_w_fs bos.net.tcp.client 6.1.9.0 6.1.9.315 key_w_fs bos.net.tcp.client 7.1.4.0 7.1.4.32 key_w_fs bos.net.tcp.client 7.1.5.0 7.1.5.15 key_w_fs bos.net.tcp.sendmail 7.2.0.0 7.2.0.2 key_w_fs bos.net.tcp.sendmail 7.2.1.0 7.2.1.1 key_w_fs bos.net.tcp.sendmail 7.2.2.0 7.2.2.15 key_w_fs Note: To find out whether the affected filesets are installed on your systems, refer to the lslpp command found in AIX user's guide. Example: lslpp -L | grep -i bos.net.tcp.client Remediation/Fixes A. APARS IBM has assigned the following APARs to this problem: AIX Level APAR Availability SP KEY - ------------------------------------------------ 5.3.12 IJ03273 ** N/A key_w_apar 6.1.9 IJ02915 ** SP12 key_w_apar 7.1.4 IJ02917 ** SP7 key_w_apar 7.1.5 IJ03121 ** SP4 key_w_apar 7.2.0 IJ02918 ** SP7 key_w_apar 7.2.1 IJ02919 ** SP5 key_w_apar 7.2.2 IJ02920 ** SP3 key_w_apar ** Please refer to AIX support lifecycle information page for availability of Service Packs: http://www-01.ibm.com/support/docview.wss-uid=isg3T1012517 Subscribe to the APARs here: http://www.ibm.com/support/docview.wss-uid=isg1IJ03273 http://www.ibm.com/support/docview.wss-uid=isg1IJ02915 http://www.ibm.com/support/docview.wss-uid=isg1IJ02917 http://www.ibm.com/support/docview.wss-uid=isg1IJ03121 http://www.ibm.com/support/docview.wss-uid=isg1IJ02918 http://www.ibm.com/support/docview.wss-uid=isg1IJ02919 http://www.ibm.com/support/docview.wss-uid=isg1IJ02920 https://www.ibm.com/support/docview.wss-uid=isg1IJ03273 https://www.ibm.com/support/docview.wss-uid=isg1IJ02915 https://www.ibm.com/support/docview.wss-uid=isg1IJ02917 https://www.ibm.com/support/docview.wss-uid=isg1IJ03121 https://www.ibm.com/support/docview.wss-uid=isg1IJ02918 https://www.ibm.com/support/docview.wss-uid=isg1IJ02919 https://www.ibm.com/support/docview.wss-uid=isg1IJ02920 By subscribing, you will receive periodic email alerting you to the status of the APAR, and a link to download the fix once it becomes available. B. FIXES Fixes are available. The fixes can be downloaded via ftp or http from: ftp://aix.software.ibm.com/aix/efixes/security/sendmail_fix3.tar http://aix.software.ibm.com/aix/efixes/security/sendmail_fix3.tar https://aix.software.ibm.com/aix/efixes/security/sendmail_fix3.tar The links above are to a tar file containing this signed advisory, fix packages, and OpenSSL signatures for each package. The fixes below include prerequisite checking. This will enforce the correct mapping between the fixes and AIX Technology Levels. Please note that the below table refers to AIX TL/SP level as opposed to fileset level, i.e., 7.1.4.5 is AIX 7100-04-05. AIX Level Interim Fix (*.Z) KEY - ---------------------------------------------- 5.3.12.9 IJ03273s9a.180116.epkg.Z key_w_fix 6.1.9.9 IJ02915s9a.180110.epkg.Z key_w_fix 6.1.9.10 IJ02915s9a.180110.epkg.Z key_w_fix 6.1.9.11 IJ02915s9a.180110.epkg.Z key_w_fix 7.1.4.3 IJ02917s3a.180105.epkg.Z key_w_fix 7.1.4.4 IJ02917s3a.180105.epkg.Z key_w_fix 7.1.4.5 IJ02917s3a.180105.epkg.Z key_w_fix 7.1.5.0 IJ03121s0a.180110.epkg.Z key_w_fix 7.1.5.1 IJ03121s0a.180110.epkg.Z key_w_fix 7.1.5.2 IJ03121s0a.180110.epkg.Z key_w_fix 7.2.0.3 IJ02918s3a.180108.epkg.Z key_w_fix 7.2.0.4 IJ02918s3a.180108.epkg.Z key_w_fix 7.2.0.5 IJ02918s3a.180108.epkg.Z key_w_fix 7.2.1.1 IJ02919s1a.180108.epkg.Z key_w_fix 7.2.1.2 IJ02919s1a.180108.epkg.Z key_w_fix 7.2.1.3 IJ02919s1a.180108.epkg.Z key_w_fix 7.2.2.0 IJ02920s0a.180110.epkg.Z key_w_fix 7.2.2.1 IJ02920s0a.180110.epkg.Z key_w_fix 7.2.2.2 IJ02920s0a.180110.epkg.Z key_w_fix VIOS Level Interim Fix (*.Z) KEY - ----------------------------------------------- 2.2.4.40 IJ02915s9a.180110.epkg.Z key_w_fix 2.2.4.50 IJ02915s9a.180110.epkg.Z key_w_fix 2.2.5.20 IJ02915s9a.180110.epkg.Z key_w_fix 2.2.5.30 IJ02915s9a.180110.epkg.Z key_w_fix 2.2.6.10 IJ02915s9a.180110.epkg.Z key_w_fix 2.2.6.20 IJ02915s9a.180110.epkg.Z key_w_fix 2.2.6.21 IJ02915s9a.180110.epkg.Z key_w_fix To extract the fixes from the tar file: tar xvf sendmail_fix3.tar cd sendmail_fix3 Verify you have retrieved the fixes intact: The checksums below were generated using the "openssl dgst -sha256 [filename]" command as the following: openssl dgst -sha256 filename KEY - ----------------------------------------------------------------------------------------------------- 2987f7b0b4c549c958f6919974adf104452f9179a4e004c5f862d2473e751dfc IJ02915s9a.180110.epkg.Z key_w_csum fbb7fc0fcbb30d6ccd2e1761c4682cf7e0252aeb64e60493e12d48f6c44510b0 IJ02917s3a.180105.epkg.Z key_w_csum a0e3e1fbf9f7015ef72ffe181c7995862fb9f52d901ae3d7b0e8a98ae0af7994 IJ02918s3a.180108.epkg.Z key_w_csum bb2c7189784b734808aa637cf7ecfec5bd816cb42d9e5d812ac8e09abba6299d IJ02919s1a.180108.epkg.Z key_w_csum 4a907f461a36a1a63941b0cca8992b366d71197f7d47c63e425d5614ac072157 IJ02920s0a.180110.epkg.Z key_w_csum 4d95acdd312b233cedb5e106dfcdb8ac2266a11c402837545ea4963f929e7515 IJ03121s0a.180110.epkg.Z key_w_csum 6663891d15e91f5f316e4f73c2a7e0d23dca31df2508e98cd0cc06bb227da55b IJ03273s9a.180116.epkg.Z key_w_csum These sums should match exactly. The OpenSSL signatures in the tar file and on this advisory can also be used to verify the integrity of the fixes. If the sums or signatures cannot be confirmed, contact IBM Support at http://ibm.com/ support/ and describe the discrepancy. openssl dgst -sha1 -verify [pubkey_file] -signature [advisory_file].sig [advisory_file] openssl dgst -sha1 -verify [pubkey_file] -signature [ifix_file].sig [ifix_file] Published advisory OpenSSL signature file location: http://aix.software.ibm.com/aix/efixes/security/sendmail_advisory3.asc.sig https://aix.software.ibm.com/aix/efixes/security/sendmail_advisory3.asc.sig ftp://aix.software.ibm.com/aix/efixes/security/sendmail_advisory3.asc.sig C. FIX AND INTERIM FIX INSTALLATION IMPORTANT: If possible, it is recommended that a mksysb backup of the system be created. Verify it is both bootable and readable before proceeding. To preview a fix installation: installp -a -d fix_name -p all # where fix_name is the name of the # fix package being previewed. To install a fix package: installp -a -d fix_name -X all # where fix_name is the name of the # fix package being installed. Interim fixes have had limited functional and regression testing but not the full regression testing that takes place for Service Packs; however, IBM does fully support them. Interim fix management documentation can be found at: http://www14.software.ibm.com/webapp/set2/sas/f/aix.efixmgmt/home.html https://www14.software.ibm.com/webapp/set2/sas/f/aix.efixmgmt/home.html To preview an interim fix installation: emgr -e epkg_name -p # where epkg_name is the name of the # interim fix package being previewed. To install an interim fix package: emgr -e epkg_name -X # where epkg_name is the name of the # interim fix package being installed. Workarounds and Mitigations None. References Complete CVSS v2 Guide On-line Calculator v2 Related information IBM Secure Engineering Web Portal IBM Product Security Incident Response Blog AIX Security Bulletin (ASCII format) Acknowledgement None. *The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin. Disclaimer According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY. Document information More support for: AIX family Software version: 5.3, 6.1, 7.1, 7.2 Operating system(s): AIX Software edition: Advanced, Enterprise, Standard Reference #: T1027341 Modified date: 06 April 2018 - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBWsr8yYx+lLeg9Ub1AQitORAAgCs95gWAXXErJTSENVzxxRYKMrF1Ma6l JAzIOfCHU+Rzt+OMFGlGXJnUWY14GHs4WoJV9pNeSN+7qKwvLAJvzuEErRb5xhh9 DCJ7Wyu3k1YNQjlusClVG667JtgHMZjKdhNwfibtU1qJTMvyl00xXf/BONXzWwhh ilUABUhpjepl59GCm7HUvkEMuo6UOi7oeL37WrrFgr57ztie/BhUH8VmBZcLOjF1 WGZ+07UgSjQxRu5OKxpitnyaWlxKtBwRKWoE0Eq6twZWcsbDiYbvp387vIQl4jRz vq/UNP2g3fZMP959Rolfm0Qf7WrKFnBwCAh1f/6XKW2oOAUm635vimGNQXX1Y54o rVd2zJJmMUpW4HZ/ykzncWuXJjFObtd27NFc7lQiDXLn1p+PoieWUTwnhYZZvzFu w7T8P/faZkZbjNOCJxLxwAf6mx0tSWKqe/LKyP8ha4jpruK6j2jdhWHptj9qjsHd qHODze5difnpfIJ2KYU8Lk0JTPMk5p0+C1bL4UvcHYRK9Fpdg3Gcvy8nd+yUKn/v Tyiwvt2uUc1TPXoItaPWZcSYGiGdH2ngt3Uk1ui7ZPCffbsgOiquWidmp58dQpC6 3e7XxUppslw12Bau3SWBwpTG7ZKtJsTqvYwNKSjTLsAPVY7cnRItzZ7ZoT9ldGPh MuaHE+z4FpY= =/6ew -----END PGP SIGNATURE-----